signKey static method
Signs a Sec-WebSocket-Key
header sent by a WebSocket client as part of
the initial handshake.
The return value should be sent back to the client in a
Sec-WebSocket-Accept
header.
Implementation
static String signKey(String key)
// We use [codeUnits] here rather than UTF-8-decoding the string because
// [key] is expected to be base64 encoded, and so will be pure ASCII.
=>
convert.base64
.encode(sha1.convert((key + webSocketGUID).codeUnits).bytes);